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Three-Dimensional Phthalocyanine Metal-Catecholates for High Electrochemical Carbon Dioxide Reduction.

  • Author(s): Matheu, Roc
  • Gutierrez-Puebla, Enrique
  • Monge, M Ángeles
  • Diercks, Christian S
  • Kang, Joohoon
  • Prévot, Mathieu S
  • Pei, Xiaokun
  • Hanikel, Nikita
  • Zhang, Bing
  • Yang, Peidong
  • Yaghi, Omar M
  • et al.
Abstract

The synthesis of a new anionic 3D metal-catecholate framework, termed MOF-1992, is achieved by linking tetratopic cobalt phthalocyanin-2,3,9,10,16,17,23,24-octaol linkers with Fe3(-C2O2-)6(OH2)2 trimers into an extended framework of roc topology. MOF-1992 exhibits sterically accessible Co active sites together with charge transfer properties. Cathodes based on MOF-1992 and carbon black (CB) display a high coverage of electroactive sites (270 nmol cm-2) and a high current density (-16.5 mA cm-2; overpotential, -0.52 V) for the CO2 to CO reduction reaction in water (faradaic efficiency, 80%). Over the 6 h experiment, MOF-1992/CB cathodes reach turnover numbers of 5800 with turnover frequencies of 0.20 s-1 per active site.

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